From: Sasha Levin <levinsasha928@gmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Minchan Kim <minchan@kernel.org>, Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: raise MemFree by reverting percpu_pagelist_fraction to 0
Date: Fri, 11 May 2012 18:35:00 +0200 [thread overview]
Message-ID: <CA+1xoqc15HY1rECsJ6Aj1WMzwT12z4DByJhFopyBAiKawEFh3Q@mail.gmail.com> (raw)
In-Reply-To: <CA+55aFxsZqU4bXRz61ngnR2ozH=AAhwGHR+PqzdTRfnCxJY0oQ@mail.gmail.com>
On Fri, May 11, 2012 at 6:27 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Fri, May 11, 2012 at 2:01 AM, Minchan Kim <minchan@kernel.org> wrote:
>>
>> I didn't have a time so made quick patch to show just concept.
>> Not tested and Not consider carefully.
>> If anyone doesn't oppose, I will send formal patch which will have more beauty code.
>
> What's so magical about that '8' *anyway*? We do we have that minimum at all?
>
> At the very least, the 8-vs-0 thing needs to be explained.
The '0' acts as an "off" switch.
Once it's on, we reserve 1/x of the pages for the pagelists. I'm not
sure why 8 was selected in the first place, but I guess it made sense
that you don't want to reserve 15%+ of your memory for the pagelists.
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next prev parent reply other threads:[~2012-05-11 16:35 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-11 8:00 Hugh Dickins
2012-05-11 8:30 ` Sasha Levin
2012-05-11 8:38 ` Minchan Kim
2012-05-11 9:01 ` Minchan Kim
2012-05-11 16:27 ` Linus Torvalds
2012-05-11 16:35 ` Sasha Levin [this message]
2012-05-11 16:54 ` Linus Torvalds
2012-05-14 8:51 ` Cong Wang
2012-05-11 14:10 ` Hugh Dickins
2012-05-14 1:51 ` Minchan Kim
2012-05-11 16:26 ` Linus Torvalds
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